/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl.rel;



import com.bff.gaia.unified.sdk.extensions.sql.UnifiedSqlTable;

import com.bff.gaia.unified.sdk.transforms.PTransform;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PCollectionList;

import com.bff.gaia.unified.sdk.values.Row;

import org.apache.calcite.plan.RelOptCluster;

import org.apache.calcite.plan.RelOptTable;

import org.apache.calcite.rel.core.TableScan;



import java.util.Map;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkArgument;



/** UnifiedRelNode to replace a {@code TableScan} node. */

public class UnifiedIOSourceRel extends TableScan implements UnifiedRelNode {



  private final UnifiedSqlTable sqlTable;

  private final Map<String, String> pipelineOptions;



  public UnifiedIOSourceRel(

      RelOptCluster cluster,

      RelOptTable table,

      UnifiedSqlTable sqlTable,

      Map<String, String> pipelineOptions) {

    super(cluster, cluster.traitSetOf(UnifiedLogicalConvention.INSTANCE), table);

    this.sqlTable = sqlTable;

    this.pipelineOptions = pipelineOptions;

  }



  @Override

  public PCollection.IsBounded isBounded() {

    return sqlTable.isBounded();

  }



  @Override

  public PTransform<PCollectionList<Row>, PCollection<Row>> buildPTransform() {

    return new Transform();

  }



  private class Transform extends PTransform<PCollectionList<Row>, PCollection<Row>> {



    @Override

    public PCollection<Row> expand(PCollectionList<Row> input) {

      checkArgument(

          input.size() == 0,

          "Should not have received input for %s: %s",

          UnifiedIOSourceRel.class.getSimpleName(),

          input);

      return sqlTable.buildIOReader(input.getPipeline().begin());

    }

  }



  protected UnifiedSqlTable getUnifiedSqlTable() {

    return sqlTable;

  }



  @Override

  public Map<String, String> getPipelineOptions() {

    return pipelineOptions;

  }

}